28755980 has 48 divisors (see below), whose sum is σ = 68753664. Its totient is φ = 10000320.

The previous prime is 28755973. The next prime is 28755983. The reversal of 28755980 is 8955782.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28755983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2219 + ... + 7901.

It is an arithmetic number, because the mean of its divisors is an integer number (1432368).

Almost surely, 2^28755980 is an apocalyptic number.

28755980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28755980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34376832).

28755980 is an abundant number, since it is smaller than the sum of its proper divisors (39997684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28755980 is a wasteful number, since it uses less digits than its factorization.

28755980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5726 (or 5724 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 28755980 is about 5362.4602562630. The cubic root of 28755980 is about 306.3675222980.

The spelling of 28755980 in words is "twenty-eight million, seven hundred fifty-five thousand, nine hundred eighty".